Selected nutrients (ammonia, ammonia plus organic nitrogen, nitrite, nitrite plus nitrate) in ground water

DESCRIPTION OF CONTENTS OF FILE GW1NUTR1.DAT


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| DATA FILE FORMAT |
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columns  1-15  Station ID number
columns 21-26  Date (YYMMDD format)
columns 31-34  Time
columns 41-49  Streamflow (Storet code 00061, cubic feet per second)
column  51     Remark for dissolved ammonia
columns 52-59  Dissolved ammonia (Storet code 00608, in milligrams per
               liter as N)
column  61     Remark for dissolved nitrite
columns 62-69  Dissolved nitrite (Storet code 00613, in milligrams per liter as N)
column  71     Remark for dissolved ammonia plus organic nitrogen
columns 72-79  Dissolved ammonia plus organic nitrogen (Storet code 00623,
               in milligrams per liter as N)
column  81     Remark for dissolved nitrite plus nitrate
columns 82-89  Dissolved nitrite plus nitrate (Storet code 00631, in milligrams
               per liter as N)


NOTES: A <  symbol in the remarks field indicates the pesticide was not
       detected in the sample.


       An E in the remarks field indicates the concentration given is estimated.
       (An E remark associated with a low concentration typically indicates the
       compound was positively identified but that the concentration is less
       than the method detection limit.  An E remark associated with a high
       concentration typically indicates the reported concentration exceeded
       the range of the calibration standards and was estimated by
       extrapolation.)


       Water levels or concentrations less than zero (for example -999.999)
       indicate no data are available for that observation.




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| STATION INFORMATION |
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Data are available for 94 wells.  Data were collected between June 1994 and
August 1995.  Well location, depth, and screened interval information may be
obtained by retrieving the file 'gw1sta.txt'.




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| METHODS          |
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All samples were analyzed by the U.S. Geological Survey National Water Quality
Laboratory.  Samples were collected using the methods of Koterba and others
(1995).




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| REFERENCES       |
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Koterba, M.T., Wilde, F.D., and Lapham, W.W., 1995, Ground-water data-collection
protocols and procedures for the National Water-Quality Assessment Program:
Collection and documentation of water-quality samples and related data: U.S.
Geological Survey Open-File Report 95-399, 113 p.